<template>
  <div>
   <span v-for="(item,index) in arr" :key="index">
      <input type="checkbox" v-model="All" :value="item">
         <span>{{ item}}</span>
    </span>
       <p>你选中的元素, 累加的值和为: {{ sum }}</p>
  </div>
</template>

<script>
export default {
  data(){
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      All:[]
    } 
  },
  computed:{
    sum() {
      return this.All.reduce((sum,val)=>sum+=val,0)
    }
  }
}
</script>

<style>

</style>